Why do they christen cast plaster of paris?

Why do they christen cast plaster of paris?
Plaster is made from the mineral gypsum, which is called Calcium Sulphate by chemists (Gypsum within the ground is calcium sulphate dihydrate, after calcining, it becomes calcium sulphate hemihydrate, also specified as hydrous calcium sulphate.) It is often call plaster of Paris, because of the large deposits of pure gypsum underlying the French capitol, which be utilized early on by local artisans.

Plaster of Paris, or simply plaster, is a type of building stuff based on calcium sulfate hemihydrate (gypsum.)
A massive gypsum deposit at Montmartre in Paris is the source of the given name.
A large gypsum deposit at Montmartre within Paris is the source of the name.
The first place they used that mixture for plaster be near Paris.
Casts used to be formed from plaster of paris, it's just been surrounded by the last15-20 years that the switch over to fiberglass casts started. Even near a fiberglass cast, it is still plaster underneath the fiberglass "tape".